CIE A Level Biology复习笔记2.1.2 The Benedict's Test
The Benedict's Test for Reducing Sugars Method Add Benedict's reagent (which is blue as it contains copper (II) sulfate ions) to a sample solution in a test tube It is important that an excess of B...
CIE A Level Biology复习笔记2.1.1 Biological Molecule Tests
Testing for Key Biological Molecules There are a number of tests that can be carried out quickly and easily in a lab to determine if a sample contains one of the key biological molecules (carbohydr...
CIE A Level Biology复习笔记1.2.5 Viruses
Key Features of Viruses Viruses are non-cellular infectious particles that straddle the boundary between ‘living’ and ‘non-living’ They are relatively simple in structure; much smaller than prokary...
CIE A Level Biology复习笔记1.2.4 Prokaryotic v Eukaryotic Cells
Structural Features of Typical Prokaryotic Cells Animal and plant cells are types of eukaryotic cells, whereas bacteria are a type of prokaryote Prokaryotes have a cellular structure distinct from ...
CIE A Level Biology复习笔记1.2.3 The Vital Role of ATP
The Vital Role of ATP All organisms require a constant supply of energy to maintain their cells and stay alive This energy is required: In anabolic reactions – building larger molecules from smalle...
CIE A Level Biology复习笔记1.2.2 Animal & Plant Cells
Electron Micrographs: Animal Cells TEM electron micrograph of an animal cell showing key features Exam Tip You should be able to describe and interpret photomicrographs, electron micrographs and dr...
CIE A Level Biology复习笔记1.1.5 Calculating Actual Size
Calculating Actual Size When investigating the size of organisms and biological structures you will use a microscope of a specific magnification to produce an image Photomicrographs are images obta...
CIE A Level Biology复习笔记1.1.4 Resolution & Magnification
Resolution & Magnification Magnification Magnification is how many times bigger the image of a specimen observed is in compared to the actual (real-life) size of the specimen A light microscope...
CIE A Level Biology复习笔记1.1.3 Eyepiece Graticules & Stage Micrometers
Eyepiece Graticules & Stage Micrometers An eyepiece graticule and stage micrometer are used to measure the size of the object when viewed under a microscope Each microscope can vary slightly so...
CIE A Level Biology复习笔记1.1.2 Magnification Calculations
Magnification Calculations Magnification is how many times bigger the image of a specimen observed is in comparison to the actual (real-life) size of the specimen The magnification (M) of an object...
CIE A Level Biology复习笔记1.1.1 The Microscope in Cell Studies
Microscope Slide Preparation In order to observe cellular material in more detail, specimens can be prepared for viewing under a light microscope Samples need to be thin enough to allow light to pa...
AQA A Level Maths: Statistics复习笔记6.1 Large Data Set
Using a Large Data Set What is a large data set? As part of your course there is a large data set that you can use It contains lots of information You are not expected to memorise any results from ...
